1. 運動：studying math 學數學 | exercising 運動 | playing Scrabble 玩美國的一個拼字遊戲
2. 操演：Testing 测试 | Exercising 操演 | Verification 验证
3. 练习：Growing:成长 | Exercising: 练习 | Strength:加强
noun
1. the activity of exerting your muscles in various ways to keep fit
e.g. the doctor recommended regular exercise
he did some exercising
the physical exertion required by his work kept him fit